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The domain structure of enzymerhodopsins. CrHKR1 and CrHKR3, histidine kinase 1 and 3, respectively, from the green alga C. reinhardtii; BeGC1, rhodopsin guanylylcyclase from the water mold B. emersonii; SrER, enzymerhodopsin from the choanoflagellate S. rosetta; RR, response regulator domain; G/A cyclase, gunanylyl/adenylyl cyclase domain.
